Installed Adobe lightroom cc 2015 a half an hour ago. Unfortunately it does not start. No error message - just nothing. Tried various compatibility modes. I'm logged into Win 8.1 with admin rights. Does anybody have an idea?

Tried that & I got the same crashing behaviour every time! I even did a complete uninstallation (Including Preferences Files) to maybe fix the issue, no success. LR6 launched at my very first attempt but never after. Now that my catalogue got updated, it can’t be used with LR5 either!

Tried that & I got the same crashing behaviour every time! I even did a complete uninstallation (Including Preferences Files) to maybe fix the issue, no success. LR6 launched at my very first attempt but never after. Now that my catalogue got updated, it can’t be used with LR5 either!

PS: I still have my LR5 on my system. (MacBook Pro Retina Display)

Look in your LR6 catalog folder and see if there is a file with the extension .lock .....Catalog.lrcat.lock. If so delete just that file. Next follow the procedure to Sign Out and back in using the Creative Clod app. Now try relaunching LR 6.

Please provide the LR product you are using, how you installed it, and ALL symptoms and messages you are seeing. Please be as detailed as possible as to 1) what happened after the initial installation, 2) what you did afterwards, and 3) what is happening now.

My issue (update from earlier today) from above was not on Adobe's end. My driver on my graphics card needed updated. 2 year old machine with a 1GB graphics card. I would have not thought of this. Adobe was wonderful in helping me and Lightroom CC2015 is working once again.

my LR CC shut down when i work in developer mode, not oncz but continue, it can happend when i scroll between my foto's ans also when i work on a photo, i have try to reinstall several times, also logout en in with the cloud app, still the same problem.

But I finally found the reason behind all the crashes. Since according to most of the instructions a fresh sign in was required I got suspicious that my host file may be the cause & after a quick clean up I found out I was right.

Glad to hear you resolved the issue! Would you please explain how you "cleaned up the host file?" What host file you are referring to? A detailed explanation will help others who land here with the same issue. Thank you.

Sry again it took so long to reply back. By "host" file I meant the one in /private/etc/hosts which map different hostnames to specified IPs.It lets you to address to point a website address to a desired IP address, or block access to a site.